import java.util.Scanner;

class Main{
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		String s=new String();
		int c=0,w=0,i;
		s=sc.next();
		sc.close();
		for(i=0;i<s.length();++i) {
			if(s.charAt(i)=='c') ++c;
			else ++w;
		}
		System.out.print(--c<w?c:w);
	}
}